com.bigdata.ha.msg

Interface IHARootBlockRequest

All Superinterfaces:

IHAMessage, Serializable

All Known Implementing Classes:

HARootBlockRequest

public interface IHARootBlockRequest
extends IHAMessage

Message requesting a root block for a store on a remote service.

Method Summary

Methods

Modifier and Type	Method and Description
UUID	getStoreUUID() The UUID of the journal whose root block will be returned (optional, defaults to the current Journal).
boolean	isNonBlocking() When true the request should be non-blocking.

Method Detail

getStoreUUID

UUID getStoreUUID()

The UUID of the journal whose root block will be returned (optional, defaults to the current Journal).

Note: This parameter is intended for scale-out if there is a need to fetch the root block of a historical journal (versus the live journal).

isNonBlocking

boolean isNonBlocking()

When true the request should be non-blocking. Otherwise the request should obtain the lock that guards the update of the root block in the commit protocol such that the caller can not observe a root block that has been updated but where the commit protocol is still in its critical section.

Note: The non-blocking form of the request is used in some context where the avoidence of a deadlock is necessary. The blocking form is used in some contexts where we need to await a specific commit point on the service (typically under test suite control).